.banner {
    width: 100%;
    position: relative;
    overflow: hidden;
    padding-bottom: 30px;
}
.banner-list {
    position: relative;
    height: 680px;
}
.banner-item {
    position: absolute;
    overflow: hidden;
}
.banner-item a {
    display: block;
    background-color: #000;
    width: 100%;
    height: 100%;
}
.banner-item img {
    width: 100%;
    height: 100%;
}
.arrow {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 1px solid #fff;
    position: absolute;
    top: 295px;
    z-index: 3;
}
.arrow-left {
    background: url('../images/icon/arrow_left_icon.png') no-repeat;
    background-size: 100% 100%;
    left: 20%;
}
.arrow-right {
    background: url('../images/icon/arrow_right_icon.png') no-repeat;
    background-size: 100% 100%;
    right: 20%;
}